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function convertCurrency(currencyDigits) {
    // Constants:
    var MAXIMUM_NUMBER = 99999999999.99;
    // Predefine the radix characters and currency symbols for output:
    var CN_ZERO = "零";
    var CN_ONE = "壹";
    var CN_TWO = "贰";
    var CN_THREE = "叁";
    var CN_FOUR = "肆";
    var CN_FIVE = "伍";
    var CN_SIX = "陆";
    var CN_SEVEN = "柒";
    var CN_EIGHT = "捌";
    var CN_NINE = "玖";
    var CN_TEN = "拾";
    var CN_HUNDRED = "佰";
    var CN_THOUSAND = "仟";
    var CN_TEN_THOUSAND = "万";
    var CN_HUNDRED_MILLION = "亿";
    var CN_SYMBOL = "（RMB）";
    var CN_DOLLAR = "元";
    var CN_TEN_CENT = "角";
    var CN_CENT = "分";
    var CN_INTEGER = "整";
 
    // Variables:
    var integral; // Represent integral part of digit number.
    var decimal; // Represent decimal part of digit number.
    var outputCharacters; // The output result.
    var parts;
    var digits, radices, bigRadices, decimals;
    var zeroCount;
    var i, p, d;
    var quotient, modulus;
 
    // Validate input string:
    currencyDigits = currencyDigits.toString();
    if (currencyDigits == "") {
        alert("Empty input!");
        return "";
    }
    if (currencyDigits.match(/[^,.\d]/) != null) {
        alert("Invalid characters in the input string!");
        return "";
    }
    if ((currencyDigits).match(/^((\d{1,3}(,\d{3})*(.((\d{3},)*\d{1,3}))?)|(\d+(.\d+)?))$/) == null) {
        alert("Illegal format of digit number!");
        return "";
    }
 
    // Normalize the format of input digits:
    currencyDigits = currencyDigits.replace(/,/g, ""); // Remove comma delimiters.
    currencyDigits = currencyDigits.replace(/^0+/, ""); // Trim zeros at the beginning.
    // Assert the number is not greater than the maximum number.
    if (Number(currencyDigits) > MAXIMUM_NUMBER) {
        alert("Too large a number to convert!");
        return "";
    }
 
    // Process the coversion from currency digits to characters:
    // Separate integral and decimal parts before processing coversion:
    parts = currencyDigits.split(".");
    if (parts.length > 1) {
        integral = parts[0];
        decimal = parts[1];
        // Cut down redundant decimal digits that are after the second.
        decimal = decimal.substr(0, 2);
    }
    else {
        integral = parts[0];
        decimal = "";
    }
    // Prepare the characters corresponding to the digits:
    digits = new Array(CN_ZERO, CN_ONE, CN_TWO, CN_THREE, CN_FOUR, CN_FIVE, CN_SIX, CN_SEVEN, CN_EIGHT, CN_NINE);
    radices = new Array("", CN_TEN, CN_HUNDRED, CN_THOUSAND);
    bigRadices = new Array("", CN_TEN_THOUSAND, CN_HUNDRED_MILLION);
    decimals = new Array(CN_TEN_CENT, CN_CENT);
    // Start processing:
    outputCharacters = "";
    // Process integral part if it is larger than 0:
    if (Number(integral) > 0) {
        zeroCount = 0;
        for (i = 0; i < integral.length; i++) {
            p = integral.length - i - 1;
            d = integral.substr(i, 1);
            quotient = p / 4;
            modulus = p % 4;
            if (d == "0") {
                zeroCount++;
            }
            else {
                if (zeroCount > 0)
                {
                    outputCharacters += digits[0];
                }
                zeroCount = 0;
                outputCharacters += digits[Number(d)] + radices[modulus];
            }
            if (modulus == 0 && zeroCount < 4) {
                outputCharacters += bigRadices[quotient];
            }
        }
        outputCharacters += CN_DOLLAR;
    }
    // Process decimal part if there is:
    if (decimal != "") {
        for (i = 0; i < decimal.length; i++) {
            d = decimal.substr(i, 1);
            if (d != "0") {
                outputCharacters += digits[Number(d)] + decimals[i];
            }
        }
    }
    // Confirm and return the final output string:
    if (outputCharacters == "") {
        outputCharacters = CN_ZERO + CN_DOLLAR;
    }
    if (decimal == "") {
        outputCharacters += CN_INTEGER;
    }
    outputCharacters = CN_SYMBOL + outputCharacters;
    return outputCharacters;
}


function atoc(numberValue) {
    var numberValue = new String(Math.round(numberValue * 100)); // 数字金额  
    var chineseValue = ""; // 转换后的汉字金额  
    var String1 = "零壹贰叁肆伍陆柒捌玖"; // 汉字数字  
    var String2 = "万仟佰拾亿仟佰拾万仟佰拾元角分"; // 对应单位  
    var len = numberValue.length; // numberValue 的字符串长度  
    var Ch1; // 数字的汉语读法  
    var Ch2; // 数字位的汉字读法  
    var nZero = 0; // 用来计算连续的零值的个数  
    var String3; // 指定位置的数值  
    if (len > 15) {
        alert("超出计算范围");
        return "";
    }
    if (numberValue == 0) {
        chineseValue = "零元整";
        return chineseValue;
    }
    String2 = String2.substr(String2.length - len, len); // 取出对应位数的STRING2的值  
    for (var i = 0; i < len; i++) {
        String3 = parseInt(numberValue.substr(i, 1), 10); // 取出需转换的某一位的值  
        if (i != (len - 3) && i != (len - 7) && i != (len - 11) && i != (len - 15)) {
            if (String3 == 0) {
                Ch1 = "";
                Ch2 = "";
                nZero = nZero + 1;
            }
            else if (String3 != 0 && nZero != 0) {
                Ch1 = "零" + String1.substr(String3, 1);
                Ch2 = String2.substr(i, 1);
                nZero = 0;
            }
            else {
                Ch1 = String1.substr(String3, 1);
                Ch2 = String2.substr(i, 1);
                nZero = 0;
            }
        }
        else { // 该位是万亿，亿，万，元位等关键位  
            if (String3 != 0 && nZero != 0) {
                Ch1 = "零" + String1.substr(String3, 1);
                Ch2 = String2.substr(i, 1);
                nZero = 0;
            }
            else if (String3 != 0 && nZero == 0) {
                Ch1 = String1.substr(String3, 1);
                Ch2 = String2.substr(i, 1);
                nZero = 0;
            }
            else if (String3 == 0 && nZero >= 3) {
                Ch1 = "";
                Ch2 = "";
                nZero = nZero + 1;
            }
            else {
                Ch1 = "";
                Ch2 = String2.substr(i, 1);
                nZero = nZero + 1;
            }
            if (i == (len - 11) || i == (len - 3)) { // 如果该位是亿位或元位，则必须写上  
                Ch2 = String2.substr(i, 1);
            }
        }
        chineseValue = chineseValue + Ch1 + Ch2;
    }
    if (String3 == 0) { // 最后一位（分）为0时，加上“整”  
        chineseValue = chineseValue + "整";
    }
    return chineseValue;
}
